Perhaps this is somewhat old news, but I notice that KBXX and KMJQ now have digital sidebands present, signifying the launch of IBOC/HD. Hadn't seen any mention of it on these boards.With the addition of IBOC/HD on 97.9, it means all nine Senior Road FM transmitters are sending out the digital signals. Anyone with a HD radio hearing any HD2/3 programming on either KBXX or KMJQ? BTW, no sign of IBOC/HD on co-owned KROI. If that station is indeed headed for the block, RO probably won't bother adding digital capability.
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More IBOC/HD in Houston
- Thread starter Mediafrog+
- Start date
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All 9 stations were planned for IBOC when the antenna work was done late last year...it probably took Radio One this long to get equipment installed (and their STL working for the digitial side...depends on where they have their encoders placed)...KROI's site is out by itself and would require a new xmtr or major rework on the current one (Continental 816R last I remember) to work with IBOC...I think the road is using crossfed in the combiner and a dual port panel antenna so they could reuse their analog transmitters and add the new digital ones with little effort (besides the rooms were too small to add highpower combining and talk about a waste of RF power, heat, etc)Mediafrog+ said:
KBXX's calls show up on my radio but doesn't switch to HD. KMJQ shows no signs of digital signal as of midnight.
Hmmmm....guess the IBOC on those stations is brand new after all, and still in the testing phase.StevenNOLA said:
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It shouldnt because the IBOC sidebands are supposed to be within the 200kHz Mask of the FM channel....There may be some minor adjacent slop over BUT since the data streams are on either side of the analog carrier and are redundant, that should not be a problem...What the upper stream may get hot on, the lower stream will make up for it...jras20 said:
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No, the data stream contains all the audio info for both HD-1 and HD-2...its just a matter of breaking up the stream to be decoded correctly..The digital carriers (on either side of the analog carrier) have it all and its redundant (upper and lower carriers are the same information)jras20 said:
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rbrucecarter5
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Incorrect. The digital sidebands overlap adjacent frequencies. Legal jamming and interference. Part of "the plan" to eliminate competition by jamming it - they posted this openly about AM on another forum. The FM jamming is prevalent in the East. Can't let those DC folks tune adjacents in Baltimore / Philly folks tune adjacents in NYC / etc. - they won't hear the commercials the station owners want them to hear. Hopefully - this travesty of legal jamming will self-implode when people yawn collectively and get Sirius and XM. Maybe - in 20 years or so - the numbers of legal jammers in the US will be decreasing as IBOC are no longer available and the remaining IBOC fanatics are marginalized the way AM stereo fanatics are today.CW said:
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rbrucecarter5 said:
Im afraid you have the facts wrong...NOW dont get me wrong, I am NOT a fan of IBOC on AM and I have my doubts of IBOC on FM.....but the FACTS are the digital carriers DO FIT within the 200kHz channel mask (see below)...BEFORE, there were NOT any high density power signals in the upper freqs of the channel and were being used by the subcarriers which are 5% of main modulation--being analog low density, thus hardly causing 1st adjacent issues...BUT with IBOC, the carriers are there, are at 1% of the analog main power BUT the power density is constant across the entire output thus causing more issues than the FM analog subcarriers...for those wanting to know the actual FM mask and look of a IBOC in hybrid mode, the following URLs will get you all the info you need: http://beradio.com/eyeoniboc/radio_iboc_fm_waveform/
and http://www.ibiquity.com/technology/pdf/Conversion_Requirements.pdf as well as
http://www.nrscstandards.org/DRB/Non-NRSC reports/FM_all_digital_report.pdf
True, the last two are by our friends at Ibiquity but the info is good for reading...and the technical details are there..
BUT the issue is NOT xmtr interference but the rcvrs not being able to reject the digital carrier NOW so close to 1st adj...HOWEVER, stations are not spaced that close regardless of NYC or Texas (though Class Bs up there are spaced closer than the full Class Cs we have down here). However, laws of physics are the same....signal contours are spaced so that stations are properly spaced to prevent adj interference and front end overload...NOW we have IBOC which "theoretically" should not cause any problems..if the IF filters in the rcvrs were perfect...but they arent...they have slopes at the edge and cannot reject NEAR freq signals well enough and some noise, etc does get through to cause issues...it was THOUGHT the signal levels would be low enough not to cause this problem...in a hybrid system though, they have found out it doesnt work as well as they expected (at least the FM does work....but not as well as it should)..
AM IBOC?? Forget it...I doubt it last....FM IBOC may die too like QUAD and other FM "improvements" in the past....time will tell....(there has been BIG discussion on the Radio Tech remailer about IBOC recently...and the overall feeling is the big names like CC, etc are the ones behind it...the ma and pa broadcasters out there cannot afford it and never will...will analog go away? The general feeling is NO)
And in answer to Jras20, YES, the 1st adj signals should NOT affect you listening to KBXX HD-2 (if you are in the city grade contour), which is what he asked. Out on the fringe, it will be the same as trying to listen to the main analog carrier with the adj stations closer to you. It can be a crap shoot.
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